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haralanov wrote:

I will not call this excitement, let say it dynamic stability.

Hm, the “dynamic stability”. This is a new objective…

cv wrote:

I suspect [David]he feels more comfortable with coils running at low voltage than (what I guess was) 200-400V or so.

David had commented on this in private email. He looks like has no attitude about it and will be experimenting with it.

cv wrote:

In any case, *very* interested to hear more about your devices, particularly the long fibre paper cones and leather suspension - are you willing to divulge more?

Yes, the driver is very good and it is long know that a properly made leather suspension is the most interesting for MF drivers. The problem is that those cones is VERY difficult to get nowadays, I guess Haralanov use some kind very old diaphragms that he took from old driver. Those cones are not being made like this nowadays.

haralanovwrote:

Don't you think some of the old dirvers use high voltages (some of them 250V) for their electromagnets because of a very rational reason?

Haralanov, Haralanov, let do not mislead ourselves. The old drivers use high voltages for electromagnets not due to the sonic reasons but because economic reasons. They use fieldcoil of electromagnets combined with input choke filter of power supply for the entire unit. I have to note that all of drivers where high ripples just after rectifiers go into fieldcoil of electromagnets sound bad if they used “as is”. I do have quite many of them.

audiofilofine wrote:

are pair of jbl 2420 work with 100-130 volt power supply is with 5u4 tube i use with diy tactrix horn and jensen field coil woofers. crossover at 800 hz 6 db or when use 3 way multiamplification 800-8000 in this case tweeter is old jensen-magnavox.

Audiofilofine, I am sure you have compared the permanent magnet JBL 2420 with 2420 electromagnet. Would you mind to share your observations?

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